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Library of Congress Subject Areas (15946)
- A General Works (62)
  - AC Collections. Series. Collected works (17)
  - AI Indexes (General) (22)
  - AM Museums (General). Collectors and collecting (General) (5)
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- B Philosophy. Psychology. Religion (27)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (5)
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- E History America (1)
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- G Geography. Anthropology. Recreation (41)
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- H Social Sciences (5500)
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    - HD1401 Agriculture-Economic aspects (100)
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- M Music and Books on Music (10)
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- N Fine Arts (805)
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- P Language and Literature (429)
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- Q Science (1246)
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- R Medicine (20)
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- S Agriculture (1329)
  - S Agriculture (General) (1139)
    - S590-599.9 Soils. Soil science (150)
    - S631-667 Fertilizers and Improvement of the soil (133)
  - SB Plant culture (226)
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    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (115)
  - SD Forestry (24)
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  - SK Hunting sports (1)
- T Technology (4966)
  - T Technology (General) (1592)
    - T55.4-60.8 Industrial engineering. Management engineering (374)
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    - T385 Computer Graphics (84)
    - T58.6-58.62 Management Information Systems (472)
  - TA Engineering (General). Civil engineering (General) (531)
  - TC Hydraulic engineering. Ocean engineering (9)
  - TD Environmental technology. Sanitary engineering (861)
  - TE Highway engineering. Roads and pavements (34)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (2)
  - TH Building construction (65)
  - TJ Mechanical engineering and machinery (48)
  - TK Electrical engineering. Electronics Nuclear engineering (101)
    - TK5105 Computer Network (42)
    - TK5105.882 Internet (37)
    - TK5105.888 World Wild Web (42)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (1770)
    - TP155 Chemical engineering (1329)
    - TP368 Food processing and manufacture (308)
    - TP500 Fermentation industries. Beverages. Alcohol (16)
  - TR Photography (8)
  - TS Manufactures (233)
    - TS 155-194 Production Management, Operations Management (168)
    - TS 180-TS180.8 Material Handling (9)
  - TT Handicrafts Arts and crafts (9)
  - TX Home economics (15)
- U Military Science (8)
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- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (51)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (28)
  - Z719 Libraries (General) (9)
  - ZA Information resources (17)
    - ZA4050 Electronic information resources (6)
    - ZA4450 Databases (9)